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11 Modbus register map
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MN012007EN March 2019 www.eaton.com
11.3.10 Exception codes
When there’s error in request or response, trip unit would respond an exception code.
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If the function code in the query is not supported by trip unit, exception code 01 is
returned in the response, also used for the unsupported sub-function code in Modbus
diagnostics.
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If the requested data register/ bit address is illegal, exception code 02 is returned.
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If the data in the query is illegal, exception code 03 is returned.
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If trip unit doesn’t support the query function, exception code 04 is returned.
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In certain circumstances, exception code 05(ACK) is returned.
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If trip unit can’t perform the current request at this time, a BUSY exception code 06 is
returned.
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If trip unit can’t perform the requested action, a NAK exception code 07 is returned.
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If only a partial register is used in the query, exception code 132 is returned.
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If the requested event entry doesn’t exist, exception code 135 is returned.